Which is what the infringers hope - and the major engine driving much of Amazon's profits.
Fraud.
I remember when people used to (heck still do) get worked up about Walmart but those same people not only order from Amazon all the time, they even join B mans private club (Prime).
You sue Amazon for contributory infringement. Subpoena for the number of fraudulent copies they sold and then press for triple damages plus all of your fees. Even if that number is tiny you'll cost them much more in legal bills.
I'm not sure why I'd spend $50k forcing Amazon to spend $250k. They can play that game a lot longer than me.
Honestly, all the stories in this thread make me very glad I canceled my Prime subscription. I still use Amazon occasionally, but now most of my purchases go direct. With the exception of books; there I order from my local bookstore.